Question

I would like to have a JUnit (or other) system where the enterprise beans can be tested in a mock environment so that all resources/beans and so on are injected locally. The enterprise beans should not have to accomplish this. All kinds of injection should be supported.

• I would like to have a maven plugin for this so that the tests can be run from a maven build.
• Transactions are not necessary during the unit tests,this would require a complete container.

Do you know of such a maven plugin or test framework? Experiences with it?

Answer 1

Not necessarily the easiest way, but I managed to get this working using JBoss’s embeddable EJB3.0 container, with major assistance from Java Persistence with Hibernate

For a start, I don’t know of maven plugins/dependencies for this, so I had to install my own locally:

(1) Download jboss-EJB-3.0_Embeddable_ALPHA_9.zip from downloads

(2) This zipfile contains two important JARs:

• jboss-ejb3-all.jar
• thirdparty-all.jar

(3) Install these JARs into your local repository (use your own initials instead of nkl):

mvn install:install-file \     -Dfile=jboss-ejb3-all.jar \     -DgroupId=nkl.jboss.embedded \     -DartifactId=jboss-ejb3-all \     -Dversion=3.0-alpha-9  mvn install:install-file \     -Dfile=thirdparty-all.jar \     -DgroupId=nkl.jboss.embedded \     -DartifactId=thirdparty-all \     -Dversion=3.0-alpha-9 

(4) If all has gone well, you should now have two directories in your local repository.

(5) Now add the following dependencies to your pom.xml

    <dependency>       <groupId>nkl.jboss.embedded</groupId>       <artifactId>jboss-ejb3-all</artifactId>       <version>3.0-alpha-9</version>     </dependency>     <dependency>       <groupId>nkl.jboss.embedded</groupId>       <artifactId>thirdparty-all</artifactId>       <version>3.0-alpha-9</version>     </dependency> 

(6) I also needed to add dependencies for HSQLDB, and SLF4J

(7) You need to copy some files from the conf directory of the zipfile to the src/main/resources directory of your project:

• default.persistence.properties
• ejb3-interceptors-aop.xml
• embedded-jboss-beans.xml
• jndi.properties

(8) I created my own beans.xml and persistence.xml files in src/main/resources/META-INF:

<?xml version='1.0' encoding='UTF-8'?> <deployment xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'   xsi:schemaLocation='urn:jboss:bean-deployer bean-deployer_1_0.xsd' xmlns='urn:jboss:bean-deployer'>   <bean name='messageDSBootstrap' class='org.jboss.resource.adapter.jdbc.local.LocalTxDataSource'>     <property name='jndiName'>java:/messageDS</property>     <property name='driverClass'>org.hsqldb.jdbcDriver     </property>     <property name='connectionURL'>jdbc:hsqldb:test</property>     <property name='minSize'>0</property>     <property name='maxSize'>10</property>     <property name='blockingTimeout'>1000</property>     <property name='idleTimeout'>30000</property>     <property name='transactionManager'>       <inject bean='TransactionManager' />     </property>     <property name='cachedConnectionManager'>       <inject bean='CachedConnectionManager' />     </property>     <property name='initialContextProperties'>       <inject bean='InitialContextProperties' />     </property>   </bean>   <bean name='messageDS' class='java.lang.Object'>     <constructor factoryMethod='getDatasource'>       <factory bean='messageDSBootstrap' />     </constructor>   </bean> </deployment>  <persistence xmlns='http://java.sun.com/xml/ns/persistence'   xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'   xsi:schemaLocation='http://java.sun.com/xml/ns/persistence    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd'   version='1.0'>   <persistence-unit name='jpa'>     <provider>org.hibernate.ejb.HibernatePersistence</provider>     <jta-data-source>java:/messageDS</jta-data-source>     <properties>       <property name='hibernate.dialect' value='org.hibernate.dialect.HSQLDialect' />       <property name='hibernate.show_sql' value='true' />       <property name='hibernate.format_sql' value='true' />       <property name='hibernate.hbm2ddl.auto' value='create' />     </properties>   </persistence-unit> </persistence> 

(9) I created a unit test like the following, using additional infomation from here.

package org.nkl;  import java.io.File;  import javax.naming.InitialContext;  import org.jboss.ejb3.embedded.EJB3StandaloneBootstrap; import org.jboss.ejb3.embedded.EJB3StandaloneDeployer; import org.junit.Test; import org.nkl.model.MessageHandler;  public class BasicTest {      @Test     public void testEjb() throws Exception {         EJB3StandaloneBootstrap.boot(null);         EJB3StandaloneBootstrap.deployXmlResource('META-INF/beans.xml');         EJB3StandaloneDeployer deployer = EJB3StandaloneBootstrap                 .createDeployer();          deployer.getArchives().add(new File('target/classes').toURI().toURL());          deployer.create();         deployer.start();         InitialContext context = new InitialContext();         MessageHandler messageHandler = (MessageHandler) context                 .lookup('MessageHandlerBean/local');         messageHandler.saveMessages();         messageHandler.showMessages();         EJB3StandaloneBootstrap.shutdown();     } } 

(10) This uses a simple SLSB like:

package org.nkl.ejb;  import java.util.List;  import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext;  import org.nkl.model.Message; import org.nkl.model.MessageHandler; import org.slf4j.Logger; import org.slf4j.LoggerFactory;  @Stateless public class MessageHandlerBean implements MessageHandler {      @PersistenceContext     private EntityManager em;      Logger logger = LoggerFactory.getLogger(MessageHandlerBean.class);      public void saveMessages() {         logger.info('In saveMessages');         em.persist(new Message('Hello World'));     }      @SuppressWarnings('unchecked')     public void showMessages() {         logger.info('In showMessages');         List messages = em.createQuery(                 'select m from Message m order by m.text asc').getResultList();         for (Object o : messages) {             logger.info(((Message) o).getText());         }     } } 

(11) And a Message entity class like:

package org.nkl.model;  import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table;  @Entity @Table(name = 'MESSAGES') public class Message {     @Id     @GeneratedValue     @Column(name = 'MESSAGE_ID')     private Long id;     @Column(name = 'MESSAGE_TEXT')     private String text;     @ManyToOne(cascade = CascadeType.ALL)     @JoinColumn(name = 'NEXT_MESSAGE')     private Message nextMessage;      public Message(String text) {         this.text = text;     }      Message() {}      // setters/getters not shown.  } 

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Lets just say there are a number of stumbling blocks along the way in this approach.

Notably to do with the order of dependencies.

Good luck!!